Product Brief
ADI rolls isolators for I2C designs
Brian Fuller8/24/2010 8:10 PM EDT
Comment
Robotics Developer
I thought that CAN was developed for the automotive industry. Is there a move ...
Skyhigh
Eyeing potentially lucrative applications in hybrid-electric vehicle (HEV) designs, Analog Devices has unveiled automotive-grade I2C isolators to attack traditional bidirectional isolation issues on the popular bus.
The ADuM1250W hot swappable, dual I2C digital isolator eliminates optocouplers and support circuitry previously required in isolated I2C interfaces.
HEV and automotive applications require that controllers or peripherals be isolated from the bus to avoid interference or harmful voltage levels. Designers do this using optocouplers, but the approach increases the cost and complexity of the I2C interface. The unidirectional optocouplers must be accommodated by separating each of the two bidirectional I2C channels into two unidirectional channels.
The ADuM1250W uses ADI’s iCoupler technology, which employs chip-scale transformers, rather than on the LEDs and photodiodes found in optocouplers.
Key features:
Pricing and availability:
The ADuM1250W hot swappable, dual I2C digital isolator eliminates optocouplers and support circuitry previously required in isolated I2C interfaces.
HEV and automotive applications require that controllers or peripherals be isolated from the bus to avoid interference or harmful voltage levels. Designers do this using optocouplers, but the approach increases the cost and complexity of the I2C interface. The unidirectional optocouplers must be accommodated by separating each of the two bidirectional I2C channels into two unidirectional channels.
The ADuM1250W uses ADI’s iCoupler technology, which employs chip-scale transformers, rather than on the LEDs and photodiodes found in optocouplers.
Key features:
- AEC-Q100 qualified, 125˚C operation, supports the quality and reliability requirements of automotive applications
- Small surface mount 8-lead SOIC package saves up to 80% board space
- True bi-directional isolated data paths eliminate the need for buffers and other external components
- 1MHz operation provides ample bandwidth to operate with high performance peripherals and devices
- 3.0- to 5.5-V supply/logic levels enables flexible operation and level shifting
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Pricing and availability:
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GREAT-Terry
8/31/2010 6:04 AM EDT
I2C is not a good bus system in automotive. Why don't they build isolated CAN which is more RS485 like?
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Skyhigh
8/31/2010 6:51 AM EDT
Agreed. Isolated CAN makes better sense.
It doesn't make any sense to make isolated I2C because hardly anyone using I2C for longer than 10m (although it can stretch this length). It makes better sense if ADI makes I2C bridge (between different VDD of 5V, 3.3V, 2.5V, 1.8V etc) makes even better sense.
Intersil and Sipex has isolated RS-485, and Linear has isolated RS-485 and power.
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Robotics Developer
8/31/2010 12:37 PM EDT
I thought that CAN was developed for the automotive industry. Is there a move away from CAN towards I2C or is it a trial run at replacing the CAN with a lower cost solution? I am not familiar with the cost trade-offs between the two buses but and am wondering why would we CAN the current approach?
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